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Tentukan jumlah 40 suku pertama pada deret aritmetika berikut!

Rani Maharani

Soal

Tentukan jumlah 40 suku pertama pada deret aritmetika berikut!

85 + 82 + 79 + 76 + ….

Pembahasan

Sn = n/2 [2a + (n-1)d]

S40 = 40/2 [2(85) + (40-1)(-3)] S40 = 20 [170 - 117] S40 = 20 (53) S40 = 1060 Jadi, jumlah 40 suku pertama pada deret aritmetika ini adalah 1060.

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